B1S1 no activity thinking bad ECU

[Jack@European_Parts]

Jack any updates for the ECU for SAI problems not O2 problem?

Good Luck

No but I can tell you that if the OXS are not right, it will and can give you ghost SAI issues when none exist.

 

[vwtech]

Once I got the code for B1S1 that's what I figured was causing the ghost SAI code for the past year.

Damn thing is killing me.

Good Luck

 

[vwtech]

Okay Yesterday was a another Polish day for me.

Scratch the question on the code setting when ECU runs SAI readiness test.
As we all know SAI runs the readiness for SAI at idle so that isn't the cause.
I am just way over thinking this and my brain is fried.

Good Luck

 

[ivagp]

The computer uses SIA to check on oxygen sensor. Have you checked all Plumbing exhaust, intake leaks with smoke.

 

[Jack@European_Parts]

Readiness bit for SAI won't complete a test or until the CAT has been qualified.

 

[vwtech]

Okay so decided to recheck everything. All Vac. hoses and no leaks found anywhere. Jack there is no aux Vac pump by the rack on this car.
I also manually opened Kombi valve and jumped the SAI relay to run the pump with engine off and tail pipes blocked.
And I found a very small exhaust leak at the flex joint of down pipe on B1 about 2 inches downstream of the O2 in question.
With this car running the exhaust is loud to a degree but designed that way so you couldn’t hear an exhaust leak.
It is also so tight of an area that hot and running motor you can’t feel for it.
But with a cold not running engine and SAI pump & Kombi jumped I could feel slight air out the flex joint.

So I know the down pipe is leaking at the flex joint and it will have to be replaced at some time soon.
Changing the ECU is a guess at best? I told customer we need to change the down pipe because I know it’s bad and that it is not a guess.
If it fixes the problem great but at least it is not wasted money because sooner or later it will get very loud.

Thought about just welding in a new flex joint but the time it takes to change this down pipe being an R32 AWD OE is the only way to go.
Changing the down pipe was PITA. Saving the flange on the $1500 duel cat was real hard also.
I also used the Northside O2 on bank 2 and the dealer O2 on bank 1 that’s was cool no wasted parts.

Against all advice I again bought the down pipe from Northside Imports for $530 which is nuts for 2 pipes with flex joints and no cat.
But the down pipe was original V.W. OE and a lot cheaper.
Sorry guy’s, but saw no reason to pay more for the exact same part.

But this solved the problem and car is perfect. This flex joint was a very small leak but only a few inches away from B1S1.
I still can’t believe it caused the scanner too totally stop reading the O2 after 4 miles of driving.
I would of expected an inaccurate reading from this O2 because of a small leak but not a totally dead O2 reading on VCDS.
Could someone please explain that one? I do know that no exhaust leaks are basic but that’s crazy. This was a very small leak.

Auto scan after fix below…

Thanks &
Good Luck

Thursday,25,May,2017,14:34:32:46081
VCDS -- Windows Based VAG/VAS Emulator Running on Windows XP x86
VCDS Version: 17.1.3.0
Data version: 20170320 DS267.7
www.Ross-Tech.com


VIN: WVWKG61J64D133455   License Plate: 
Mileage: 167600km-104141mi   Repair Order: 


Chassis Type: 1J (1J - VW Golf/Bora IV (1998 > 2006))
Scan: 01 02 03 08 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57 75
          76
 
VIN: WVWKG61J64D133455   Mileage: 167600km-104141miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 022-906-032-BJS.lbl
   Part No SW: 022 906 032 EG    HW: 14. 4.0 3
   Component: MOTRONIC ME7.1.1G   5927  
   Coding: 0000132
   Shop #: WSC 31413 000 00000
   VCID: 54ACF01EF44F4EE11D-5102

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1C0-907-37x-ESP-A.lbl
   Part No: 1C0 907 379 P
   Component: ESP ALLRAD MK60     0101  
   Coding: 0023049
   Shop #: WSC 31414 000 00000
   VCID: 3776A79245F985F918-5102

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 3Bx-907-044.lbl
   Part No: 3B1 907 044 C
   Component: CLIMATRONIC     C 2.0.0  
   Coding: 11200
   Shop #: WSC 31414  
   VCID: 214269CAAB7DEB49C6-515A

1 Fault Found:
01274 - Air Flow Flap Positioning Motor (V71) 
            37-10 - Faulty - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 1C0 909 605 F
   Component: 17 AIRBAG VW61 0108 0003  
   Coding: 12599
   Shop #: WSC 31414  
   VCID: 275677D2C559157988-50E6

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 1J0-920-xx5-17.lbl
   Part No: 1J0 920 927 A
   Component: KOMBI+WEGFAHRSP VDO V03  
   Coding: 15230
   Shop #: WSC 00000  
   VCID: 295271EAD34D23099E-50E6
   WVWKG61J64D133455     VWZ7Z0D9770087

1 Fault Found:
01304 - Radio 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-19.lbl
   Part No: 6N0 909 901 
   Component: Gateway K<->CAN    0001  
   Coding: 00006
   Shop #: WSC 31414  
   VCID: 70E45C8E301712C119-50E6

1 Fault Found:
01304 - Radio 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 22: AWD        Labels: 02D-900-554.lbl
   Part No: 02D 900 554 D
   Component: HALDEX LSC  ECC     0011  
   VCID: 214269CAAB7DEB49C6-4ACE

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 1C0-959-799.lbl
   Part No: 1C0 959 799 C
   Component: C7 Komfortgerát HLO 0003  
   Coding: 00064
   Shop #: WSC 31414  
   VCID: 3776A79215F985F918-4ACE

   Subsystem 1 - Part No: 1C1959801A
   Component: C7 Tõrsteuer.FS KLO 0202  

   Subsystem 2 - Part No: 1C1959802A
   Component: C7 Tõrsteuer.BF KLO 0202  

No fault code found.

End-------------------------(Elapsed Time: 05:22)--------------------------

 

[Jack@European_Parts]

All it takes is a small leak or FOD sensor and the RTFB does explain that if leaks are in the exhaust or faulty sensor even "small" can cause this type of DTC.

The controller goes dead because if it doesn't see a specific table value during the aging process, it rejects the sensor and relies on another; further crimpling the readiness path from completing since the sensor isn't qualified.

 

[PetrolDave]

But this solved the problem and car is perfect. This flex joint was a very small leak but only a few inches away from B1S1.
I still can’t believe it caused the scanner too totally stop reading the O2 after 4 miles of driving.
I would of expected an inaccurate reading from this O2 because of a small leak but not a totally dead O2 reading on VCDS.
Could someone please explain that one? I do know that no exhaust leaks are basic but that’s crazy. This was a very small leak.

VCDS just passes on what the engine ECU reports - so if VAG wrote the engine ECU software to report dead O2 sensor instead of a small leak, then that's all VCDS can show.

 

[vwtech]

I wasn't trying to blame VCDS. It's the best tool ever owned.
But this was a weird problem the leak was very small couldn't hear it.
Set a code for B1S1 no activity. 90% of the time I see that code it's an dead O2.
I know it's not VCDS and it's VAG software but this was a strange reaction to a very small exhaust leak.

I have seen many O2 problems from an exhaust leak but never saw an O2 or software react the the way this one did.
I have never see any O2 work fine then just go dead every 4 miles like clock work. If that's not strange then I don't know what strange is.

I did not mean to offend VCDS or anybody in this post. I did bust balls a little bit but didn't mean anything by it. If in any way I offend anyone I am sorry.

I am just glad it's fixed but this was strange....

Good Luck

 

[Jack@European_Parts]

Hey Stan Lee Marvel Comics.........

FYI:

Techniques and tools to consider to use..............

You might find that using metal tape around flex flanges helps test for this or any exhaust connection leaving vapor trail to identify with sending a UV dye through the intake.

Additionally a leak detector for AC can sniff the halogens in the exhaust area and a UV light will see a path while the sniffer can excite the meter if it has an external air agitator.